package com.ruoyi.auth.service;

import com.google.code.kaptcha.Producer;
import com.ruoyi.auth.config.properties.CaptchaProperties;
import com.ruoyi.common.core.constant.CacheConstants;
import com.ruoyi.common.core.constant.Constants;
import com.ruoyi.common.core.exception.CaptchaException;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.common.core.utils.sign.Base64;
import com.ruoyi.common.core.utils.uuid.IdUtils;
import com.ruoyi.common.core.web.domain.AjaxResult;
import com.ruoyi.common.redis.service.RedisService;
import org.springframework.stereotype.Service;
import org.springframework.util.FastByteArrayOutputStream;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * 验证码实现处理
 * @author ruoyi
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
    @Resource (name = "captchaProducer")
    private Producer captchaProducer;

    @Resource (name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Resource
    private RedisService redisService;

    @Resource
    private CaptchaProperties captchaProperties;

    /**
     * 生成验证码
     */
    @Override
    public AjaxResult createCaptcha () throws IOException, CaptchaException {
        AjaxResult ajax = AjaxResult.success ();
        boolean captchaEnabled = captchaProperties.getEnabled ();
        ajax.put ( "captchaEnabled", captchaEnabled );
        if ( ! captchaEnabled ) {
            return ajax;
        }

        // 保存验证码信息
        String uuid = IdUtils.simpleUUID ();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        String captchaType = captchaProperties.getType ();
        // 生成验证码
        if ( "math".equals ( captchaType ) ) {
            String capText = captchaProducerMath.createText ();
            capStr = capText.substring ( 0, capText.lastIndexOf ( "@" ) );
            code = capText.substring ( capText.lastIndexOf ( "@" ) + 1 );
            image = captchaProducerMath.createImage ( capStr );
        } else if ( "char".equals ( captchaType ) ) {
            capStr = code = captchaProducer.createText ();
            image = captchaProducer.createImage ( capStr );
        }

        redisService.setCacheObject ( verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES );
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream ();
        try {
            ImageIO.write ( image, "jpg", os );
        } catch ( IOException e ) {
            return AjaxResult.error ( e.getMessage () );
        }

        ajax.put ( "uuid", uuid );
        ajax.put ( "img", Base64.encode ( os.toByteArray () ) );
        return ajax;
    }

    /**
     * 校验验证码
     */
    @Override
    public void checkCaptcha (String code, String uuid) throws CaptchaException {
        if ( StringUtils.isEmpty ( code ) ) {
            throw new CaptchaException ( "验证码不能为空" );
        }
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + StringUtils.nvl ( uuid, "" );
        String captcha = redisService.getCacheObject ( verifyKey );
        if ( captcha == null ) {
            throw new CaptchaException ( "验证码已失效" );
        }
        redisService.deleteObject ( verifyKey );
        if ( ! code.equalsIgnoreCase ( captcha ) ) {
            throw new CaptchaException ( "验证码错误" );
        }
    }
}
